Borinic Acid-Catalyzed, Regioselective Ring Opening of 3,4-Epoxy Alcohols
作者:Grace Wang、Graham E. Garrett、Mark S. Taylor
DOI:10.1021/acs.orglett.8b02295
日期:2018.9.7
Diarylborinic acids (Ar2BOH) catalyze the C3-selective ring opening of 3,4-epoxy alcohols with aniline, dialkylamine and arenethiol nucleophiles. The regiochemical outcome is consistent with a catalytic tethering mechanism in which the borinic acid interacts with both the electrophile and the nucleophile. The rate acceleration resulting from this induced intramolecularity effect is sufficient to overcome
Palladium-catalyzed enantioselective Heck alkenylation of trisubstituted allylic alkenols: a redox-relay strategy to construct vicinal stereocenters
作者:Chun Zhang、Brandon Tutkowski、Ryan J. DeLuca、Leo A. Joyce、Olaf Wiest、Matthew S. Sigman
DOI:10.1039/c6sc04585e
日期:——
An enantioselective, redox-relay Heck alkenylation of trisubstituted allylic alkenol substrates has been developed. This process enables the construction of vicinal stereocenters in high diastereo- and enantioselectivity and allows the formation of enolizable α-carbonyl methyl-substituted stereocenters with no observed epimerization under the reported reaction conditions.